The U.S. sold $29 billion of two- year notes at close to the highest yield in three years, less than a week after Federal Reserve Chair Janet Yellen said interest-rate increases may come sooner than forecast.

Treasuries fell, with two-year note yields rising from a 17-month low, as Federal Reserve Bank of St. Louis President James Bullard said the central bank should consider delaying the end of its bond-buying monetary stimulus to halt a decline in inflation expectations.

Today’s $13 billion auction of 10-year Treasury Inflation Protected Securities attracted the highest demand in two years, including record purchases from a category of bidders that includes foreign central banks.

Treasury 10-year note yields fell below 1.8 percent for the first time since February as Greek politicians struggled to form a government, adding to concern that Europe’s financial turmoil is deepening and boosting demand for the safest securities.

Treasuries fell for the first time in three days as the Federal Reserve opens a meeting amid speculation it may do more to boost the economy and investors bet European leaders will make progress on their debt crisis.